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Quantitative Analysis of Effect of Shrink Fit in Cold Forging  

Li, Qiushi (School of Mechanical and Aerospace Engineering, Gyeongsang National Univ.)
Kim, Min-Cheol (School of Mechanical and Aerospace Engineering, Graduate School, Gyeongsang National Univ.)
Jung, Dong-Chan (Taeyang Metal Industrial Co.)
Son, Yo-Hun (Youngsin Metal Industrial Co.)
Joun, Man-Soo (School of Mechanical and Aerospace Engineering, Gyeongsang National Univ.)
Publication Information
Journal of the Korean Society for Precision Engineering / v.28, no.3, 2011 , pp. 301-307 More about this Journal
Abstract
In this paper, effects of major design parameters of cold forging dies on die mechanics are quantitatively investigated with emphasis on shrink fit using a thermoelastic finite element method. A ball-stud cold forging process found in a cold forging company is selected as a test process and the effects of die insert material, magnitude of shrink fit, dimension of shrink ring, number of shrink rings, partition of die insert and clamping force on effective stress and circumferential stress are analyzed. It has shown that the number of shrink rings, magnitude of shrink fit, and Young's modulus of die insert material have strong influence on compressive circumferential stress in die insert but that the influence of the other design parameters is relatively weak.
Keywords
Die Structural Analysis; Shrink Ring; Shrink Fit; Die Design Parameters; Multi-Stage Automatic Cold Forging;
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